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Rough sketch of the vent line.

Humidity In the house is around 49% which is a little high. The poly is 6 mil and is sealed well. I sealed around the penetration with spray foam from the outside. I've attached a couple of pictures of under the sink.

Material is ABS. Pipe is insulated with spray foam and rock wool insulation. I opened it up from the outside and ensure the vapor barrier is completely sealed around the pipe penetrarion. I'll draw out a picture of the pipe and add.

I'm having an issue with the vent stack for the kitchen sink. I live in Canada and its now starting to get cold outside -16 C tonight and I've noticed over the last few days there has been quite a bit of condensation on the vent piping under the sink. So far I've cut open the wall from the...